Read, write update and delete file in Ruby

file.rb

#thursday-08-2017
#@41studio
#Muhammad Yana Mulyana
#R/W File in ruby

File.open("sample.txt", "r") do |f|
  f.each_line do |line|
    puts line
  end
end

File.new("yana.txt", "w")

# read file
word_list = File.open("sample.txt")
word_in_error = catch(:done) do
  result = []
  while line = word_list.gets
    word = line.chomp
    throw(:done, word) unless word =~ /^\w+$/
    result << word
  end
    puts result.reverse
  end
  if word_in_error
    puts "Failed: '#{word_in_error}' found, but a word was expected"
  end

another way search word or character in file
File.open("sample.txt") do
  |file|
  file.each_line("e"){
    |line|
    puts "Got #{line.dump}"
  }
end

#simple way to read file in ruby
#
IO.foreach("sample.txt"){
  |line|
  puts line
}

#read count char in file

str = IO.read("sample.txt")
puts str.length

#read into array
arr = IO.readlines("sample.txt")
puts arr.length
puts arr[0]

#Write into file
puts "Enter text "
char = gets()
File.open("sample.txt", "w") do
  |file|
  a = file.puts char
  #puts a.true?
  unless a
      puts "Write file success"
    else
      puts "Faile write file"
  end
end

require "stringio"
ip = StringIO.new("Now is\nthe time\nto learn\nRuby!")
op = StringIO.new("sample.txt", "w")

ip.each_line do
  |line|
  op.puts line.reverse
end